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2. The best portable air conditioners - AOL

   www.aol.com/news/best-portable-air-conditioners...

   The air conditioner can also be used as a fan, dehumidifier and heater in the colder months. It has a 4.1-star average rating from more than 250 Amazon reviews. De’Longhi 12,500 BTU Smart ...

3. Packaged terminal air conditioner - Wikipedia

   en.wikipedia.org/wiki/Packaged_terminal_air...

   Packaged terminal air conditioner installed in a residential apartment. A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. [1] The first practical semi-portable air conditioning unit invented by engineers at Chrysler Motors. It entered the market in ...

4. This portable AC makes a room 20° colder in minutes — and it ...

   www.aol.com/lifestyle/portable-ac-makes-room-20...

   The need for air conditioning is real and lucky for us, Amazon has a budget-friendly AC unit: the Midea Portable Air Conditioner is just $250 (down from $339) with the on-page coupon.

5. This portable AC unit can make a room 20° colder in minutes

   www.aol.com/lifestyle/memorial-day-sale-portable...

   The need for air conditioning is real, and lucky for us, Amazon has a budget-friendly a/c unit: the Midea Portable Air Conditioner is just $250 with the on-page coupon. Midea $250 $339

6. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air. [37] The first inverter air conditioners were released in 1980–1981. [38] [39]

7. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Heaters exist for various types of fuel, including solid fuels, liquids, and gases. Another type of heat source is electricity, normally heating ribbons composed of high resistance wire (see Nichrome). This principle is also used for baseboard heaters and portable heaters. Electrical heaters are often used as backup or supplemental heat for ...